Variable Aperture2

( #1218)

(this MR replaces the previous "Variable Aperture" one because of a mistake in the source)

This MR allows the user:

• to optimize the signal aperture in the automatic aperture mode

Previously, we had a fixed relationship such as aperture_radius = 2*FWHM

Now, we have aperture_radius = factor*half-FWHM

(half-FWHM is used to be consistant with a radius)

• to use this improvement in a headless mode with the setphot command (setphot -force_radius=3.2 setphot -dyn_ratio=3.2)

The preset value of aperture_radius = 4*half-FWHM looks not to be optimal according to the found papers/litterature. After many tests, a value in the range [2.5;3.0] was found, depending on the session. It looks to match what has been found elsewhere.

The goal is to reduce the error bars after a light curve computation whithout altering the curve shape/details. It can be usefull for low depth occultations.

Using this variable aperture has been described in:

• Optical Photometry-Sergio Ilovaisky page 44
• EXOPLANET OBSERVING FOR AMATEURS-Bruce L. Gary , page 58
• HOPS manual (Exoclock) , page 41, where it is performed by hand

In addition, the current aperture and radii size are now parts of the light curve window (just for information).